Oligomer inhibitor for polyester fiber

Abstract

The present invention provides an oligomer inhibitor for polyester fiber that fundamentally solves the troubles caused from oligomer in dyeing process of polyester fiber or polyester blend fiber, a combination of polyester fiber and other fibers, without adverse effect on the dyeability of fiber. The oligomer inhibitor of the present invention comprises one or more of ester compounds selected from the group consisting of the ester compounds of a propylene oxide adduct of a polyhydric alcohol and alkyl or alkenyl fatty acid, and the ester compounds produced in ester exchange reaction of a propylene oxide adduct of a polyhydric alcohol and “animal or vegetable oils and fats containing alkyl and/or alkenyl fatty acid”.

1 . An oligomer inhibitor for polyester fiber comprising one or more of ester compounds selected from the group consisting of: an ester compound of a propylene oxide adduct of polyhydric alcohol and an “alkyl or alkenyl fatty acid”; and an ester compound produced in ester exchange reaction of a propylene oxide adduct of polyhydric alcohol with an animal or vegetable oil and fat containing an “alkyl or alkenyl fatty acid”.  
     
     
         2 . An oligomer inhibitor for polyester fiber defined in  claim 1  wherein the propylene oxide is added from 1 to 30 moles per 1 mole of polyhydric alcohol in the propylene oxide adduct of polyhydric alcohol.  
     
     
         3 . An oligomer inhibitor for polyester fiber defined in  claim 1  or  2  wherein the polyhydric alcohol is a trihydric alcohol, and the ester compound is a triester.  
     
     
         4 . An oligomer inhibitor for polyester fiber defined in  claim 3  wherein the trihydric alcohol is glycerin.  
     
     
         5 . An oligomer inhibitor for polyester fiber defined in any one of the  claims 1  to  4  wherein the “alkyl or alkenyl fatty acid” contains from 8 to 22 carbon atoms.  
     
     
         6 . An oligomer inhibitor for polyester fiber, which comprises an oligomer inhibitor defined in any one of  claims 1  to  5 , and a “polyester-polyether block copolymer produced from: at least one of telephthalic acid and isophthalic acid; a lower alkylene glycol; and at least one of polyalkylene glycol and polyalkylene glycol monoether”, being blended in 99-50:1-50 weight ratio.